Re: How to use and install HDR VDP?

[Rafal]

Hi,

There was a mistake in the documentation in hdrvdp-2.1.1. The new release (2.1.3) has an updated documentation with fixed example code:

reference = logspace( log10(0.1), log10(1000), 512 )' * ones( 1, 512 );

test = reference .* (1 + (rand( 512, 512 )-0.5)*0.1);

res = hdrvdp( test, reference, 'luminance', 30 );

clf;

imshow( hdrvdp_visualize( res.P_map, test ) );

Rafal

On Sunday, January 20, 2013 5:18:55 PM UTC, winwi...@gmail.com wrote:

Hi.

 

I want use HDR VDP.

 

So, I have a few questions.

 

I tried to install for HDR VDP in window 7 os.

 

First, I downloaded 'hdrvdp-2.1' and 'matlabPyrTools'.

 

Second, I added to path 'hdrvdp-2.1' and 'matlabPyrTools'.

 

1. Is this process correct? or Need I more process for using HDR VDP?

 

I made a new source and tried to example in 'hdrvdp.m'.

 

 

reference = logspace( log10(0.1), log10(1000), 512 )' * ones( 1, 512 );
test = reference .* (1 + (rand( 512, 512 )-0.5)*0.02);
[P_det P_map pe_corr] = hdrvdp( test, reference, { 'pixels_per_degree', 30, 'viewing_distance', 1 } );

 

 

But I got following error.

 

 

??? Error using ==> hdrvdp
Too many output arguments.

Error in ==> HDR_VDP at 17
[P_det P_map pe_corr] = hdrvdp( test, reference, { 'pixels_per_degree', 30, 'viewing_distance', 1 } );

 

 

2. How can I use this example?

3. If I use hdrvdp function what kind of file test and reference? .hdr? .jpg? .bmp?

 

abstract

 

1. Is this process correct? or Need I more process for using HDR VDP?

2. How can I use this example?
3. If I use hdrvdp function what kind of file test and reference? .hdr? .jpg? .bmp?

 

Please, answr my questions.

 

Thanks.

[winwi...@gmail.com]

Hi.

 

Thanks for your answer.

 

I can running HDR VDP example.

 

But I have more questions.

 

1. If I use hdrvdp function what kind of file test and reference? .hdr? .jpg? .bmp?

 

I tried to using hdrvdp function for .'jpg'.

 

 

testFileName = 'A.jpg';
refFileName = 'C.jpg';

test_img=double(imread(testFileName))/255;
ref_img=double(imread(refFileName))/255;

res = hdrvdp( test, reference, 'luminance', 30 );
clf;

imshow( hdrvdp_visualize( res.P_map, test ) );

 

But I got a error.

 

2. Can you tell me the example for image?

 

I want know more examples.

 

abstract

1. If I use hdrvdp function what kind of file test and reference? .hdr? .jpg? .bmp?

2. How can I use this function for my LDR image or multi exposure image.

 

Please, answer my questions.

 

Thanks.

 

Have a nice days!

[Rafal]

You need to post the error message in order for us to help.

My guess is that you pass a colour image while your color space specification is 'luminance' - gray-scale image.

Rafal

[winwi...@gmail.com]

Thanks for your answer.

 

I mistake that I need luminance in image.

 

Thanks I solve my problem.

 

And I have a question.

 

If I use this HDR VDP for my algorithm that is better than other algorithm.

 

How can I use HDR VDP?

 

Please answer my question.

 

Thanks.